Q&A Answers only in source code mode

Hello,
I've read all answers in your forum and couldn't find a solution for my problem. It must a be easy for most of you but not for me.
The question functionality works fine, but when I need to write an answer the form only works in source code mode. I need to click on the button to write within the form.
Can you please tell me what could it be the problem here?
Thanks
Sam